We havent seen the hammerhead yet, and places to use it will be limited, the inventory was better as here I am stuck with crappy guns until I find another gun. Plus in ME 1 I could choose lots of skills, in ME2 you can just max almost everything except one leaving little difference between characters.
What am I gonna use it for then? My third play through? Yah right...
I got it on veteran rescuing tali. Cant use it as a vangaurd though.
As for te hiding behind things I wasnt to happy at times shep wouldnt shoot around corners and die, wouldnt crouch and would die, wouldnt leave and die and would vault over and die, rare but annoying.
